Steam-engine



QNo Model.) V. 3 Sheets-Sheet 1.

' M. C. BULLOCK.

STEAM ENGINE.

190.553,159. Patented JmL 29, 1895.

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K om 0 LM LN UE DDM .M CT IS M {No Model.)

Patented Jan. 29, 1895.

flu/@M1074 7am* fil-fwn@ J MILAN o. BULLocK,or CHICAGO, ILLINOIS.

STEAM-ENGINE.

SPECIFICATION forming part of Letters `Patent No. 533,159, dated January29, 1895. Application tiled November 20,1893. Serial No. 491,472. (Nomodel.)

To all whom t may concern,.-

Be it known that I, MILAN C. BULLOOK, ct' Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Steam-Enginesg and I do hereby declare that the following is a full,

the same embracing vertically arranged single` acting cylinders andreceivers between the same supported on a common base, two piston rodsextending through the several cylinders and receivers and carrying thepistons which operate within the cylinders, and a single crank shaftprovided with two cranks on which the piston rods severally act, thepistons being movedin one direction only by the steam pressure withinthe cylinders, as in other single acting engines, and the return strokeof each piston rod being accomplished by the action of the crank shaft.The features of construction constituting my invention may, however, beapplied to single as well as multiple expansion engines and to engineshaving more than two sets of cylinders.

In the accompanying drawings illustrating my invention: Figure 1 is aview in side elevation of a triple expansion engine embodying theinvention. Fig. 2 is a central vertical section taken axially throughboth cylinders. Fig. 3 is a sectional plan view taken through bothcylinders on the lines 3 3 of Figs. 1 and 2. Fig. 4 is a similarsectional plan view taken on the lines 4 4 of Figs. 1 and 2. Fig. 5 isan enlarged detail section of the upper cylinder of the engine. Fig. 6is a detailplan section of the uppermost piston, taken on line 6-6 ofFig. 5. Fig. 7 is a detail section ot' the exhaust valve ring shown inFig. 6. Fig. S is a detail section of the plate which covers the exhaustvalve ring. Fig. 9 is a detail section through the upper end of thepiston rod, taken on line 9"-9 of Fig. 6. Fig. 10 is a detail sideelevation ot' the connections between the valve actuating rod and partswithin the steam chest. Fig. 11 is a similar view of the parts withinone of the receivers. Fig. 12 is a side view ofthe sleeve by which theexhaust valve rod is operated. Fig. 13 is a section of the same taken online 13-13 of Fig. 12. Fig. 14E is a side view ot' the upper end of thevalve-rod. Fig. 15 is a plan section thereof taken on line 15-15 of Fig.14. Fig. 16 is a detail section of the connections for operating thevalves, taken on line 16-16 of Fig. 2.

As shown in said drawings, A indicates a hollow casting forming thebaseof the engine and upon which the several cylinders and certain ofthe operative parts are mounted. Within the said base casting at thelower part thereof is mounted ahorizontal crank shaft B having twocranks B B.

C C indicate two upright cylinders afixed to the top of the base castingA and provided below their upperends with integral partitions ordiaphragms C C which constitute the heads of the cylinders proper. Saidcylinders C C are open at their lower ends and communicate with theinterior of the hollow base casting A, which latter is provided withopenings in its top while preferably somewhat larger than the interiordiameter of the cylinders C C, through which openings said cylinderscommunicate with the interior of the base casting. Said base casting isprovided below its top wall with a horizontal partition or diaphragm Awhich forms with the upper part or' said base casting a receiver orexhaust passage for steam escaping from the cylinders C C, said receiverbeing provided with an exit pipe A2 through which exhaust steam isdischarged from the engine. Said cylinders C C in their parts below thehorizontal partitions or diaphragms O C thereof constitute the lowpressure cylinders of the engine.

D VD are other cylinders which are smaller in diameter than thecylinders C C and are affixed to the upper ends of the latter. Saidcylinders D D are provided below their upper ends with horizontalpartitions or diaphragims D D forming the cylinder heads. The parts ofsaid cylinders below the said diaphragme IOO form the intermediatecylinders ofthe engine. Said cylinders D D are open at their lower endsand communicate with the upper parts of the cylinders C C.

E E indicate a third pair of cylinders, smaller in diameter than thecylinders D D and attached to the upper ends of the latter. Saidcylinders E E are provided below their upper ends with horizontalpartitions or diaphragms E E constituting the heads of said cylinders.The cylinders'E E are open at their lower ends and communicate with theupper ends of the cylinders D D, the parts of said cylinders E E belowthe diaphragms constituting the high pressure cylinders of the engine.

The upper ends of the high pressure cylinders E E are closed by means ofcastings or heads F F which form, with the upper parts of said cylindersabove the diaphragms E E thereof, steam chestsor chambers FF. Steam issupplied to said steam chests by means of a horizontal steam supply pipeF2 which communicates with a horizontal pipe F3 connecting the castingsF F with each other.

The parts of the cylinders D D above the diaphragms D D constitute steamchambers or receivers between the high pressure and intermediatecylinders, while the parts of the cylinders C C above the diaphragms C Cthereof similarly constitute steam chambers or receivers between theintermediate and low pressure cylinders.

Within the several cylinders C, D and E are located pistons C2 D2 E2which are secured to piston rods G G passing through the severalcylinder heads or diaphragms, which latter are provided with glands orpackings c d e to make tight joints around the piston rods. The saidpiston rods are herein shown as made in several separate parts orsections G G2 G3 G4 of which the lowermost and uppermost parts, G andG4, are attached to the lower and upper pistons, while the intermediateparts G2 and G3 connect the pistons with cach other. The said pistonrods are made hollow or tubular and within the same are located valverods H H which are adapted to turn within the piston rods and whichserve to actuate the exhaust valves on the several pistons. Steam issupplied to the several cylinders from the steam chest and receiversthrough steam admission valves in the several cylinder heads ordiaphragms C D E so that steam passes to the upper ends of the severalcylinders directly through the cylinder heads.

Within the base casting A are two upright air cylinders l I arranged inalignment with the steam cylinders. lVithin said air cylinders arelocated pistons J J to which the lower sections G G of the piston rodsare attached. Said air cylinders are open at their lower and closed attheir upper ends, the piston rods passing through packing boxes orglandsc'z' in the closed upper end walls l I of said air cylinders. Eachof the pistons J J is connected with the adjacent crank B of the shaftby a connecting rod J engaged, at its upper end with a transversebearing pin j secured in the piston J. The air cylinders and pistonsthus constructed serve to guide the lower end of the piston rod and alsoto retard the movement of the piston rods and connected parts duringtheir up stroke for maintaining the connecting rods and crank-pinbearings in compression at all times during the operation of the engine.The air cylinders I I are provided with air inlet openings i2 2 toafford access of air to the cylinders at each down stroke of thepistons.

The pistons of the several cylinders are actuated by steam acting in theupper ends of the cylinders only while the exhaust steam from eachcylinder in the upward stroke of the piston therein passes from theupper end of the cylinder through the exhaust valves in the piston tothe steam space or receiver in the upper part of the larger cylinderbelow it. Each cylinder being in communication at its lowerend with theupper compartment of the adjacent larger cylinder, exhaust steamentering the upper parts of the cylinders C and D in the upward strokeof the several pistons will be free to enter the lower parts of thecylinders D and E so that the upper chambers of the cylinders C and D,together with the lower parts of the cylinders D and E below the pistonsin the latter, in effect constitute the receivers between the cylinders.

The several steam inlet ports and valves as well as the exhaust portsand valves being alike in the several cylinders a description of thevalve mechanism for one cylinderwill serve for all, and the valve portsand parts of the valve mechanism of all the cylinders, are forconvenience lettered inthe same manner in the drawings.

Referring rst to the steam admission valves of the engine, the diaphragmor partition forming the head of cach cylinder is provided with anannular valve seat K which surrounds the gland or packing box thereinand in which is formed a series of ports or openings 7c 7c la IOO IIC

which extend through said diaphragm or par- Y tition into the cylinderbelow it and are arranged at equal distances apart around the cylinderhead. On the said valve seat K rests a valve ring L which is providedwith a plurality of ports Z Z corresponding in number and angulararrangement with the ports 7c 7c 7c of the cylinder head. Sai'd annularvalve ring preferably lits at its inner and outer margins againstcylindric bearing surfaces ck2formed at the inner and outer margins ofthe valve seat K to more effectively prevent the escape of steam pastthe margins of the valve ring while enabling the same to rise in case ofeX- cessive back pressure produced by water in the cylinder orotherwise.

Devices are herein shown by means of which oscillatory motion iscommunicated to the several valve rings from a reciprocating partexterior to the cylinder, as follows: The valve ring L is provided atits inner margin with an upwardly extending cylindric flange Ll of therod M slides in a guide aperture m in the cylinder wall while theopposite end of the rod is attached to a piston m which slides in ahorizontal cylinder M which is formed on or attached to the exteriorwall of the cylinder and opens at its inner end into the receiver orexhaust steam space. The piston m is adapted to slide within thecylinder M Vso as to permit endwise recprocatory motion of the rod M andsaid piston is provided with a suitable packing to prevent the escape ofsteam past the piston. The purpose of said piston is to secure endwisemovement of the valve rod M in one direction by pressure of steam on itsinner end or surface, the movement of the rod in the opposite directionbeing produced by the valve-actuating devices, as hereinafter described.The rod M is connected with the valve ring L by means of a link m2 whichis pivoted at its opposite ends to the rod and to an arm Z2 on theflange L.

As herein shown, the valve rods M M of the opposite cylinders of theengine, or those which are side by side, are arranged in alignment witheach other and connected at their adjacent ends by means of a rod M2forming in effect an extension of the rod M. The end of the rod Mnearest the exterior valve-actuating devices is extended through thehead of the cylinder M', in the manner illustrated in Fig. 3. Meansillustrated for actuating the rods M will be hereinafter described inconnection with the parts employed to operate the exhaust valves.

As hereinbefore stated, the exhaust steam fromthe upper ends of thecylinder escapes therefrom through exhaust valves carried by the pistonsthemselves, which are closed except when opened for the passage ofexhauststeam. Exhaust ports or passages, indicated by 'n n in thedrawings, are arranged in an annular valve seat N at equal distancesapart around the piston, said ports being separated from each other byspaces somewhat greater in length circumferentially than the portsthemselves.

O is an annular valve plate or ring which rests on the valve seat N andis provided with apertures 0 o corresponding in angular distance apartwith the apertures 'n n. The pistonsand exhaustvalve plates arehereinshown as provided with ports corresponding in number with those of thesimilar steam admission valve on the cylinder head so that both steaminlet and exhaust valves will have the same extent of oscillatorymovement. Means for connecting the said valve plate O with the valve rodor stem H within the hollow piston rod are herein shown as follows:Attached to the said valve stem where it passes through the piston andat a point opposite the valve plate is a ring or'collar H which isprovided with radial arms hh, which latter extend outwardly throughsuitable horizontal slots or openings formed in the body of the pistonand engaged at their outer ends with apertures 02 02 which are formed ina downwardly extending flange o on the inner marginof the Valve plate.

Inasmuch as the valve rod or stem H is located within and moveslongitudinally with the piston rod, devices for turning or givingoscillatory movement to said valve rod must obviously be connected withthe same by means of a part adapted to permit free endwise reciprocationof the' said valve rod with the piston rod while maintaining constantlysuch engagement as is necessary for turning or giving oscillatorymovement to said valve rod. The devices herein shown as employed f forthis purpose are located within the steam chest at the top of the engineand are adapted to engage with the upper end of the valve rod whichextends past the uppermost piston into the part of the hollow piston rodabove the same. For giving oscillatory motion to the valve stem I employa sleeve or tube P which is adapted to enter within the upper end of thehollow piston rod and has vertically sliding but non-rotative connectionwith the valve rod H, said tube being mounted to freely oscillate butbeing restrained from endwise movement, thereby affording a means ofcommunicating constant oscillatory movement to the valve rodnotwithstanding the up-anddown or reciprocatory movement of said valverod with the piston rod. Said tubeP is shown as fitting closely withinthe upper end of the tubular piston rod and as filling the space betweenthe same and the valve rod, which at this point is made smaller indiameter than the bore of the piston rod, this construction being usedfor compactness of construction and in order to preserve the sameexternal diameter throughout the entire length of the piston rod.

For securing sliding engagement of the tube P with the valve rod saidtube is provided with interior longitudinal grooves p which are engagedby correspondingly shaped longitudinal ribs 71.2 on` the valve rod(Figs. i) and l2 to l5). Said tube P is preferably supported or heldfrom endwise movement by being hung by a pivotal bearing at its upperend from the top wall of the steam chest. A pivotal support of the saidtube is herein shown as formed by a pivot bolt Q which is secured in thetop wall or head of the steam chest and passes through a central bearingaperture in the closed upper end of said tube, said bolt having a nut orshoulder q at its lower end to support the sleeve. Anti-friction bearingrings q g' are shown as placed between the nut or head q and the tube tolessen friction in the turning of the latter.

An anti-friction bearing is also shown as provided between the top wallof the steam chest IOO 4 scarsa and the bearing end of the tube P, 'thesame consisting of two rings q2 q2 and anti-friction rollers Q3, suchanti-friction bearing obviously taking the upward thrust which may beproduced during the up-stroke of the piston by friction al engagement ofthe tube'P with the valve stem. A similar antifriction roller bearingmay be employed to take the downward thrust and weight of the tube P inplace of the plates or washers shown in the drawings. To avoidpossibility of escape of steam around the bolt Q, which is shown aspassing through the wall of the steam chest, a screwcap Q may be appliedover the end of the bolt, as clearly shown in the drawings, Fig. 6.

To now describe the devices shown in the drawings fortransmitting motionfrom the exterior of the steam chest to the tube P by which oscillatorymotion is given to the exhaust valves in the pistons, these parts areconstructed as' follows; R is a horizontal rod which passes through bothsteam chests and the connecting pipe between them at one side of theoscillating tube referred to and which is supported at its ends in thewalls of the steam chest. One end of the rod is supported in a guideaperture r while the opposite end is provided with a piston o" slidingin a small cylinder R which is attached to or formed on the wallof thesteam chest and opens at its inner end into the said steam chest. Thepurpose of said cylinder R and piston fr is to move the rod Rin onedirection, the rod being moved in the opposite direction by thevalveactuating devices hereinbefore described. For transmittingoscillatory motion to the tubes P from said rod R the tubes are providedwith radial arms p 19 and the outer ends of said arms are connected withthe rod by links or short connecting rods r2 r2 pivoted to the arms andto the rod, in the manner illustrated. The said rod M is extended at itsends nearest the valve-actuating devices through the wall of the steamchest, in the manner illustrated. f

As a means of giving motion to the actuating rods M- of the severalsteam admission valves, devices are provided as follows-z A rock shaft Sis arranged vertically at one side of the engine, the same being mountedin brackets attached to the engine base and cylinders. Said rock shaftis provided with rigid arms ses which are connected with the ends of theseveral rods M M M which extend outside of the cylinders by means ofpivoted connecting rods s s s. A second vertical rock shaft S isprovided for actuating the exhaust valves, said second rock shaft beingconveniently located within the rock shaft S which is made of tubularform to receive it. The said rock shaft S is provided at its upper endwith a rigid `arm s2 which is connected with the end of the valve rod Rwhich extends outside ofthe adjacent steam chest by means of a pivotedconnecting rod or link s3.

For transmitting motion from the main crank shaft B to the rock shafts Sand S two oblique disks or face cams T and T are mounted on the saidcrank shaft outside of the base of the machine, the cam T being employedto actuate the rock shaft S and through it the steam admission valves,while the cam T operates the exhaust valves through the medium of therock shaft S". Said cam plate T is adapted to turn on the crank shaftand is controlled by an automatic governing device so that it forms partof an automatic cutoff mechanism for controlling the steam admissionvalves. The cam plate T, on the contrary, is affixed to and turns withthe shaft, the same being used to actuate the exhaust valves only. Fortransmitting motion from the cams T and T to the said shaftsSand S'intermediate parts are employed embracing two rock shafts U U, one ofwhich, U, is tubular and is mounted on a bracket attached to the basecasting of the engine, while the other, U', is mounted and turns withinsaid tubular shaft U. Said rock shafts U and U are arranged vertically,and attached to the upper end of the shaft U is a rigid arm u which isconnected by means of a connecting rod u with a rigid arm 35 on the rockshaft S. Similarly on the upper end of the rock shaft U is secured arigid arm u2 which is connected by a connecting rod with the rigid armS5 on the rock shaft S. Attached to the lower end of the rock shaft U isa rigid arm "w3 the free end of which rests on or bears against the facecam T, which latter thereby transmits motion through said rock shafts Uand S to the several steam admission valves. Similarly the rock shaft Ubears at its lower end a rigid arm a4 which engages the cam T so thatthe latter transmits motion through said rock s'haftsU and S to theexhaust valves.

The face cams T and T constructed as described are obviously adapted tomove the valves in one direction only and motion of the valves in theopposite direction is secured by means of the pistons m and r on therods M and R which have been hereinbefore described, pressure of steamon the said pistons obviously maintaining the arms us and a4 constantlyin contact with the cam surfaces of said cams.

The cam T which, as before described, is adapted to be turned orpartially rotated on the shaft, is controlled in its movements and itsposition is determined by means of a governing device, herein shown ashaving the form of a fly-wheel governor, applied to the fly-wheel 0rbelt pulley B2 of the engine. Said cam T is attached to or formed on asleeve T2 which is mounted on the shaft B adjacent to the pulley B2 andis provided with a rigidly attached radial arm t. Pivotally mounted onone side ofthe pulley B2 isa lever V which carries at one end a weight Vand is connected at its opposite end by means of a rod fu with the arm tof the cam sleeve. A spring V2 att-ached to the wheel rim is connectedwith the weighted end of the lever V by means of a strap or cord o andthereby holds the weight normally at the inward limit of its movement,the parts being so adjusted that when the weight isdrawn inwardly by thespring the cam will be shifted so as to move the Valves into a positionto give a maximum admission of steam to the cylinders. As the speed ofthe engine increases the centrifugal action of the Weight will move thelever V in opposition to the action of the spring and said lever, bypressing on the arm t, will turn the cam and thereby change its relationto the shaft so as to cutoff the steam supply at such point in thestroke as is determined by the speed of the engine.

The valve actuating device illustrated is only one of a number ofdevices which may be used for this purpose in connection with thefeatures of construction shown in the main working parts of the engine,such device being herein illustrated merely as one convenient andpractical way of giving motion to the valves.

In the operation of the engine illustrated it is obvious that theseveral steam admission and exhaust valves of the three connectedcylinders C, D and E will be moved at the same time to admit steam tothe several cylinders and to permit the escape of steam therefrom to thereceivers. It follows that when steam at boiler pressure is acting onthe high pressure cylinder steam previously exhausted from the highpressure and intermediate cylinders will be acting on the pistons of theintermediate and low pressure cylinders. Similarly when exhaust steam isescaping from the high pressure cylinder to the receiver below it steamwill be similarly escaping from the intermediate and low pressurecylinders to the receiver and the exhaust passages in the base of theengine. Inasmuch as the steam inlet ports lead directly through thecylinder heads or partitions and the exhaust ports lead directly throughthe pistons, steam will pass from the steam chest and receivers to theadjacent cylinders and from the cylinders to the receivers by theshortest possible paths and without passing through any extended orrestricted steam passages. It will also be noted that both the steaminlet and exhaust ports may, by the construction described, be made ofample size to give the utmost freedom 'of delivery and thus preventpossibility of Wire drawing of the steam as it enters the cylinders orof back pressure in the cylinders when the steam is being exhaustedtherefrom during the back stroke of the pistons. Furthermore, the steampasses from the steam chests and receivers to the cylinders Withoutcoming into contact with steam passages through which exhaust steam haspreviously passed, so that loss by condensation from the cause mentionedis greatly lessened.

The construction described has, on the whole, the important advantagethat the steam passes by a direct path or in a straight line from thetop to the bottom of the engine, or, in other words, from the steamchest to the exhaust of the low pressure cylinder Without passingthrough any narrow or tortuous passages or suffering any deflection fromits direct course. The steam, furthermore,takes the shortest possiblepath `and passes in all cases through passages of a minimum lengthbecause the distance traversed in passing from the steam chest orreceiver to the cylinders and from the cylinders to the receiver is onlyequal to the thickness of the diaphragme or partitions separating theseveral compartments.

The advantages derived by the construction illustrated will be betterunderstood by cons'ideration of the fact that the steam in passingthrough the several cylinders and :receivers is bodily moved only at thetime it enters the several cylinders, itbeing obvious that during theup-stroke of the pistons transference of steam from the cylinders to thereceivers is actually accomplished notby movement of the steam but bythe rising of the open or apertured pistons through the steam in thecylinders; the steam which was above the pistons at the beginning of theup-strolie being below the same at the termination thereof. The steam isthus retained in a prac- Itically solid body during its passage throughthe engine so that not only is loss of pressure by Wire drawing andfriction largely prevented but the cooling and condensation of the steamwhich must necessarily result from its passage through small andtortuous passages is largely avoided.

It Will be noted that the several steam admission valves in the engineillustrated are controlled by a single automatic governing device, saidengine in this respect being similar to that shown and described in theprior application forpatent, Serial No. 488,557, filed in the UnitedStates Patent Office October 1S,

The main features of construction herein described may obviously beapplied to a simple as well as a compound steam engine, but inasmuch asthe construction illustrated forms an important improvement in multipleexpansion engines and has its principal advantage when applied to suchengines, it is herein claimed also in connection with such multipleexpansion engines'.

I claim as my invention* l. The combination, with a single actingcylinder, and an adjacentisteam chest or receiver separated from thecylinder by a cylinder head or diaphragm provided with ports affordingdirect communication between the receiver and the cylinder, of a valvecontrolling said ports, a piston in the cylinder provided with portsextending directly through the piston, and a valve on the pistoncontrolling said ports, substantially as described.

2. The combination, with high and low pressure cylinders and anintermediate receiver in open communication with the high pressurecylinder and separated from the low pressure cylinder by a cylinder heador dia- IOO IIO

phragm provided with a steam admission valve, of pistons in thecylinders provided with exhaust valves, and a piston rod to which bothpistons are attached, substantially as described.

3. The combination with a cylinder and an adjacent steam chest orreceiver separated from the cylinder by a cylinder head or diaphragmprovided With a steam admission valve, a piston in the cylinder providedwith an exhaust valve, a piston rod attached to the piston, a valve rodfor actuating the exhaust Valve extending through and adapted to turn inthe piston rod, and means for actuating said valve rod comprising a parthaving longitudinally sliding but nonrotating connection with the saidvalve rod, substantially as described.

4. The combination With a cylinder and an adjacent steam chest orreceiver separated from the cylinder by a cylinder head or diaphragmprovided with a steam admission valve, a piston in the cylinder providedwith an exhaust valve, a piston rod attached to the piston, meansoperated from the crank shaft of the engine and connected with the steamadmission valve for actuating the same, and means also operated by thecrank shaft of the engine and extending through the piston rod foractuating said exhaust valve, substantially as described.

5. The combination with a cylinder and an adjacent steam chest orreceiver separated from the cylinder by a cylinder head or diaphragmprovided with a steam admission valve, a piston in the cylinder providedwith an exhaust valve, a piston rod attached t0 the piston, meansoperated from the crank shaft of the engine and connected with the steamadmission valve foractuating the same, and means also operated by thecrank shaft of the engine and extending through the piston rod foractuating the exhaust valve, said means for actuating the steamadmission valve embracing an automatic governing device, substantiallyas described.

G. The combination With high and lowr pressure cylinders and anintermediate receiver separated from the low pressure cylinder by apartition or diaphragm provided With a steam admission valve, ot'pistons in said cylinders provided with exhaust valves, a piston rodcarrying said pistons, said piston rod extending through the saidpartition or diaphragm, means for' actuating said steam admission valvesand means extending through the piston rod for actuating said exhaustvalves, substantially as described.

7. The combination with high and low pressure cylinders, and asteamchest and intermediate receiver separated from the high and low pressurecylinders by partitions or diaphragms provided with steam admissionvalves, of pistons in said cylinders provided With exhaust valves, apiston rod carrying said pistons and extending through both of saidpartitions or diaphragms, means for actuating said steam admissionvalves, and means for actuating the exhaust valves, embracing a valverod extendingl through the piston rod, and a part having longitudinallysliding but non-rotative connection with the said valverod,substantially as described.

8. The combination with a cylinder and an adjacent steam chest orreceiver separated from the cylinder by a cylinder head or diaphragmprovided with an nnlarly arranged steam inlet ports, a piston in thecylinder provided With a plurality of annularly arranged exhaust ports,annular valves operating in connection With said steam inlet and exhaustports, and means for actuating said exhaust valves, embracing a valverod extending through and adapted to turn in the pis ton-rod,substantially as described.

In testimony that I claim the foregoing as my invention I aliix mysignature in presence of tWo witnesses.

MILAN C. BULLOCK.

Vitnesses:

C. CLARENCE POOLE, TAYLOR E. BROWN.

